Direct Displacement of Alkoxy Groups of Vinylogous Esters by Grignard Reagents
作者:Anthony J. Brockway、Marcos González-López、James C. Fettinger、Jared T. Shaw
DOI:10.1021/jo102537n
日期:2011.5.6
The direct displacement of alkoxy groups from the β position of aromatic and unsaturated esters and ketones is described. The reaction is chemo- and regioselective, displaying wide substrate scope.
A process of producing isopropylnaphthols by oxidizing diisopropylnaphthalenes with molecular oxygen in a liquid phase to provide a reaction mixture which contains therein diisopropylnaphthalene monohydroperoxides and then acid decomposing the monohydroperoxides to isopropyl-naphthols, is characterised by separating an organic layer from the reaction mixture, adding a aliphatic alcohol of 1-4 carbons to the organic layer, and crystallizing the diisopropylnaphthalenes while allowing the diisopropylnaphthalene monohydroperoxides to remain dissolved in the organic layer thereby to separate the monohydroperoxides from the diisopropylnaphthalenes.
In a further embodiment the isopropylnaphthols are crystallised from aromatic hydrocarbons of 6-12 carbon atoms.